private List <Sampler> CreateSamplers(ShaderSubProgram shaderSubprogram)
{
/*
* Unity supports three types of samplers
* Coupled textures and sampler:
* sampler2D _MainTex;
* TODO: Investigate how they work
* Separate textures and samplers:
* Texture2D _MainTex;
* SamplerState sampler_MainTex; // "sampler" + “_MainTex”
* These samplers do not contain an entry in SamplerParameters
* Inline sampler states:
* Texture2D _MainTex;
* SamplerState my_point_clamp_sampler;
* These samplers do contain an entry in SamplerParameters
* See https://docs.unity3d.com/Manual/SL-SamplerStates.html
*/
List <Sampler> samplers = new List <Sampler>();
foreach (TextureParameter textureParam in shaderSubprogram.TextureParameters)
{
if (textureParam.SamplerIndex < 0 || textureParam.SamplerIndex == 0xFFFF)
{
continue;
}
string samplerName = "sampler" + textureParam.Name;
samplers.Add(new Sampler(samplerName, (uint)textureParam.SamplerIndex, false));
}
foreach (SamplerParameter samplerParam in shaderSubprogram.SamplerParameters ?? Array.Empty <SamplerParameter>())
{
SamplerFilterMode filterMode = (SamplerFilterMode)(samplerParam.Sampler & 0x3);
SamplerWrapMode wrapU = (SamplerWrapMode)((samplerParam.Sampler >> 2) & 0x3);
SamplerWrapMode wrapV = (SamplerWrapMode)((samplerParam.Sampler >> 4) & 0x3);
SamplerWrapMode wrapW = (SamplerWrapMode)((samplerParam.Sampler >> 6) & 0x3);
bool isComparisonSampler = (samplerParam.Sampler & 0x100) != 0;
string samplerName;
if (wrapU == wrapV && wrapU == wrapW)
{
samplerName = $"{filterMode}_{wrapU}";
}
else
{
samplerName = $"{filterMode}_{wrapU}U_{wrapV}V_{wrapW}W";
}
if (isComparisonSampler)
{
samplerName += $"_Comparison";
}
samplerName += $"_Sampler{samplerParam.BindPoint}";
samplers.Add(new Sampler(samplerName, (uint)samplerParam.BindPoint, isComparisonSampler));
}
samplers = samplers
.OrderBy(s => s.BindPoint)
.ToList();
System.Diagnostics.Debug.Assert(m_Samplers.Select(s => s.BindPoint).Distinct().Count()
== m_Samplers.Select(s => s.BindPoint).Count(), "Duplicate sampler bindpoint");
System.Diagnostics.Debug.Assert(m_Samplers.Select(s => s.BindPoint).Distinct().Count()
== m_Samplers.Select(s => s.BindPoint).Count(), "Duplicate sampler name");
return(samplers);
}
public TextureSampler(SamplerMinFilter min, SamplerMagFilter mag, SamplerWrapMode str = SamplerWrapMode.ClampToEdge)
: this(Native.TextureSampler.CreateSampler((byte)min, (byte)mag, (byte)str, (byte)str, (byte)str))
{
ManuallyRegisterCache(NativePtr, this);
}
